Her suffering will continue until some time.
SPOILER ALERT !!
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Just as FL was about to be executed, ML saved her. ML then brought her back to the mansion for treatment. During the treatment, although the effects of the poison had worn off, FL still couldn't speak. More precisely, the severe psychological trauma made her afraid to speak, leading to her losing the ability to speak.
This grueling period was hard to read. Not only FL is traumatized, but ML is also still traumatized and feels great regret for hurting FL.
Her psychological condition didn't improve during this recovery period, so with his permission FL decided to leave the mansion and ask him to let her go. ML did not simply let her go just like that. He was acting as her shadow, protecting her from afar..
FL continued her education, and during this time of separation, FL was captured by ML's older brother. ML abandoned his post and was severely injured to save FL. This was the moment FL found her voice again. The first words she uttered were ML's name as ML's life was on the line. And after that, they had to part again for a while. Before they parted, they briefly discussed their complex relationship. ML promised to return to FL, to propose again and she promised to wait for him to return.
After this long & painful journey, they can finally feel happiness even though FL and ML cannot be in the same place.

I myself is soft hearted but i haven't seen a manwha where the fl had a miscarriage, the prisoners there is kind to the fl, and the ml still doesn't know. Even the guy who spied on them knew that girl was rose, i smell the ml crying.